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Brass compression fittings with brass insert are ideal for use with copper, brass, aluminum, or plastic tubing and are commonly used on gasoline, grease, oil, water, vacuum, and air lines. The fittings are not recommended for use with steel tube.
Cut tube square on the end. Start tubing on the insert and slide into the fitting until it hits the stop. Wrench tightens approximately 1 1/2 to 2 turns beyond hand tight. Do not over tighten.